Chances of Pregnancy?

Hello, My girlfriend is chinese but studies in America (Where we both live). She had her period around December 15th (she normally has a 28 day cycle). She also takes Nikki (YAZ) birth control. She was taking the birth control while in China. I visited china. On January 7th or 8th, we were messing around and she was rubbing my penis in her vagina area. I did not ejaculate, but I imagine there was some precum. The next day, she flew back to America. The night before we messed around, she took her birth control as normal, and we messed around around 2Pm that next day. That evening we were out late and she said she forgot to take her pill. Then she had to fly back to America and wasn't able to take her pill during the flights (roughly 3 days total).

She then began to take some chinese medicine her mom gave her. She thought it was Birth Control but now it seems it might just be to help period cramps. So she roughly was off of Birth control from January 10th to about February 7th (close to a month). She then began taking her Birth Control again, but when she started to take it, she got a slight cramp everytime she took it, but wouldn't get it when she didn't take it.

The thing that had me worried was she mentioned she hasn't had her period since December 15th. Now I imagine she probably should have had her period about a week after she got to America, but she also had been off the Birth Control for over a week by then.

Do you think the missing period could be because of going off of the birth control then back on again? What are the chances she's pregnant if we didn't have intercourse, no ejaculation, and she was on pill (then stopped that night). She has been on the pill for over a year.

I should also mention that she's been under a lot of stress with school, and her future job since they keep giving her more stuff to do. About 2 weeks ago she had this really eggy looking mucous come out of her vagina. Also, when she started to retake the Nikki (YAZ), she started to get cramps again, but wouldn't get them when she stopped taking them.

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